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castortr0y [4]
4 years ago
13

What is the main function of the structure that is identified as a in the picture above

Biology
2 answers:
Rama09 [41]4 years ago
4 0
I'm sorry but there is no photo attached to it
8090 [49]4 years ago
4 0

Answer: Medium of exchange

Explanation:

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Answer:

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5.  pneumonia is very bad and is life threatening bc u are basically having a really hard time breathing bc alveoli  are where the lungs and the blood exchange oxygen and carbon dioxide released which is inhaling and exhaling

Explanation:

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